Patents by Inventor Harry J. Spineli

Harry J. Spineli has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Amine-containing block polymers for pigmented ink jet inks
    Patent number: 5272201
    Abstract: An aqueous ink jet ink composition having improved dispersion stability comprises an aqueous carrier medium, a pigment having a pH value below 7.0, and an AB block polymer consisting of an A block comprising a hydrophobic polymer having at least one basic amine functional groups, and a B block comprising a hydrophilic polymer selected from the group consisting of nonionic polymers and polymers containing acidic functional groups.
    Type: Grant
    Filed: February 20, 1992
    Date of Patent: December 21, 1993
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: Sheau-Hwa Ma, Walter R. Hertler, Harry J. Spineli, Arthur C. Shor